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Scientists have demonstrated the presence of microplastics (MPs) in tap and bottled water at various locations. On a global scale, there is still very limited information on MP pollution in drinking water. There are huge differences in reported MP concentration, but no clear conclusion can be drawn if MP content is higher in tap or bottled water. Up to date, it is not clear if these discrepancies arise from differences between the examined systems or from differences in quantification limits, the accuracy of the applied analytical techniques, or contamination during sampling, processing, and analysis. Furthermore, information on MP uptake and fate gained through animal and cell toxicity studies is very limited. To define a limit of tolerance for plastic pollution in drinking water, comparable data resulting from quality assured and controlled methods and more information on the potential uptake and fate of MPs in the human body are still needed.